<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../react18/react.development.js"></script>
  <script src="../react18/react-dom.development.js"></script>
  <script src="../react18/babel.min.js"></script>
</head>

<body>
  <div id="app"></div>
  <script type="text/babel">

    /* class App extends React.Component{
      state = {
        isHot:true
      }

      render(){
        const {isHot} = this.state;
        return (
          <div>
            <button onClick={this.changeWeaHandle} >改变天气</button>
            {
              isHot?
                <div>
                  <h1>天气真热啊</h1>
                  <p>热的雪糕都化不了</p>
                </div>
                :
                <div>
                  <h1>天气真冷啊</h1>
                  <p>冷的牙疼</p>
                </div>
            }
          </div>
        )
      }

      changeWeaHandle = ()=>{
        const {isHot} = this.state;
        this.setState({isHot:!isHot})
      }
    }

    const root = ReactDOM.createRoot(document.getElementById('app'));
    root.render(<App/>) */


    class App extends React.Component{
      state = {
        isHot: true
      }

      render(){
        const {isHot} = this.state;
        return(
          <div>
            <button onClick = {this.changeWea}></button>
            {
              isHot?
              <div>
                <p>今天真热啊</p>
              </div>
              :
              <div>
                <p>今天真冷啊</p>
              </div>
            }
          </div>
        )
      }

      changeWea = () => {
        const {isHot} = this.state;
        this.setState({isHot:!isHot})
      }

    }

    const root = ReactDOM.createRoot(document.getElementById('app'))
    root.render(<App/>)





  </script>
</body>

</html>